diff --git a/Gemfile.lock b/Gemfile.lock
index 7986bf7..882b6d0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -59,7 +59,7 @@ GEM
       listen (~> 3.0)
     katex (0.6.0)
       execjs (~> 2.7)
-    kramdown (2.3.0)
+    kramdown (2.3.1)
       rexml
     kramdown-math-katex (1.0.1)
       katex (~> 0.4)